摘要
【目的】明确不同生物炭和沼液添加量对杨树人工林土壤温室气体排放的影响。【方法】依托长期生物炭和沼液混施野外观测样地,于2019年7月到2020年1月测定不同生物炭(B0, B1, B2)和沼液(C, L, M, H)添加处理的土壤温室气体排放通量,于2019年9月和2020年1月测定土壤理化性质。通过统计分析,揭示生物炭和沼液对土壤温室气体排放的影响。【结果】添加生物炭的土壤总碳(B1:2.42±0.14%, B2:2.75±0.14%)显著高于未添加生物炭的土壤(B0:1.83±0.04%)。同样,添加生物炭的土壤总氮(B1:0.22±0.01%, B2:0.24±0.01%)显著高于未添加生物炭的土壤(B0:0.18±0.01%)。沼液添加显著提高土壤总氮含量,但生物炭与沼液对土壤总碳和总氮不存在显著交互作用。在冬季,沼液和生物炭均显著影响土壤NH_(4)^(+)-N含量,且两者存在显著性的交互作用;沼液显著增加土壤NO_(3)^(-)-N含量。在野外监测时间内,沼液显著提高了土壤N_(2)O和CH_(4)的累积排放量,增强了总增温潜势。与未添加沼液(C)处理相比,低(L)、中(M)和高剂量(H)沼液添加处理的总增温潜势分别增加了30%、40%和44%;而生物炭对土壤温室气体累积排放量和总增温潜势的影响不显著。【结论】生物炭单次添加7年后对温室气体排放的抑制效应不明显,甚至可能增加土壤温室气体的排放。沼液每年3次添加显著促进土壤温室气体的排放。因此,建议进一步研究老化效应对生物炭抑制土壤温室气体排放能力的潜在机制以及生物炭与沼液(氮肥)配施的最佳比例,以改善土壤环境并减少温室气体排放。
[Objective]The purpose of this study is to reveal the effects of combined application of biochar and biogas slurry on soil greenhouse gas emission in a poplar plantation system.[Method]The greenhouse gas emission fluxes of different biochar and biogas slurry addition treatments were measured once a month from July 2019 to January 2020based on the long-term field observation experiment station.The different treatments include four biogas slurry application rates(C,L,M,H)and three biochar application rates(B0,B1,B2).Soil physicochemical properties were measured in September 2019 and January 2020.The effects of biochar and biogas slurry on soil greenhouse gas emission were further revealed by statistical analysis.[Result]Biochar application significantly increased soil total carbon(TC)(B0:1.83±0.14%,B1:2.42±0.14%,B2:2.75±0.14%)and total nitrogen(TN)(B0:0.18±0.01%,B1:0.22±0.01%,B2:0.24±0.01%).The biogas slurry application significantly increased soil TN,but there was no significant reciprocal action between biochar and biogas slurry on soil TC and TN.In winter,both biogas slurry and biochar significantly affected the soil ammonia concentrations,and there was a significant reciprocal action between them.The biogas slurry significantly increased the soil extractable nitrate concentrations.During the field monitoring period,biogas slurry significantly increased the cumulative emissions of soil N_(2)O and CH_(4),and enhanced the total global warming potential.The total global warming potential for low(L),medium(M)and high(H)biogas slurry application increased by 30%,40%and 44%,respectively,compared with the treatment without slurry application.In contrast,biochar application showed no significant effect on the cumulative greenhouse gases emissions and the total global warming potential.[Conclusion]The inhibition effect of single biochar application on greenhouse gas emission is not significant after 7 years,and this application method may even increase soil greenhouse gas emission.The application of biogas slurry three times a year significantly promotes soil greenhouse gas emission.Therefore,it is recommended to further study the potential mechanism of aging effect on biochar and the optimal ratio of biochar and biogas slurry(nitrogen fertilizer)to improve soil environment and reduce greenhouse gases emission.
作者
陈亚娟
廖晓琳
SAADAT ULLAH MALGHANI
阮宏华
CHEN Ya-juan;LIAO Xiao-lin;MALGHANI Saadat-ullah;RUAN Hong-hua(College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2022年第4期828-838,共11页
Chinese Journal of Soil Science
基金
国家自然科学基金青年基金(42007090)和国家自然科学基金外国青年学者基金(32050410301)资助。
关键词
生物炭
沼液
杨树人工林
土壤温室气体
Biochar
Biogas slurry
Poplar plantation
Soil greenhouse gas
作者简介
陈亚娟(1997-),女,江苏泰州人,硕士研究生,主要从事森林生态系统氮循环方面的研究。E-mail:cyj0123cn@163.com;通讯作者:廖晓琳,E-mail:liaoxiaolin@njfu.edu.cn。
